Flexible-shaft driving stand



Aug.*`30, 1927.

1 w. w. ELLIOTT FLEXIBLE SHAFT DRIVING,.STAND Filed Aug. 14

. 1921 3 Sheets-Sheet? INVENTOR I WWE/#0# ATTORNEY Aug. 30,1927. I 1,641,130 W. w. ELLIOTT FLEXIBLE SHAFT DRIVING STAND Filed Aug. ,4 1921 3 Sheets-Sheet 3 3.a' z 36 68 aa INVENTOR ATTORNEY Patented Aug; 3G, v1927.

unirsesTArEs,

winrniin Wl ELLrcrT, or sor-ineen Grrr, new YORK, Assrenon To ntriivrsnnrY AND f l 1,541,130 PATENT oFFicr..

ARTHUR SHEAR, COPARTNERS, F BINGILAMTON, NEVI YORK.

FLEXIBLE-sneer Diari/rim siriani).

Appleatien nledugust e, 1921.7 Seria1 No. 489,921.

' certain movements of the liexible shaft,rin

1 such prior driving stands with which i the instance of very vsmall shafts as, for keX- ample, thoseused in dental work, electric driving motors have been arranged to swivel in--var'ious directions so as to avoid cramping of the shaft during use thereof in various positions,-but I am not aware of such driving'means having been heretofore devised which was suitable for driving comparatively large and heavy shafts such as are frequently required inV connection with r, drilling andv grinding operations onl large objects. y

Other prior driving standshave been -provided with flexiblefshaft carriers comprising` driving means consisting of eitherU universal joints', gears or belts and pulleys, Vor of conibinations of suoli means; and all of y T am acquainted have been so arranged that a constant side thrust is appli-edV incident tol the action of the driving torque to the ilexible shaft at the point of its attachment to such stands. ln the use of some of such prior stands, theforce of the side thrust referred to is insuliicient to prove seriously detrimental when a veryn limited amount of power is transmitted thereby as, for eX- ainple, in the case of dental appliances..

lnasmuch, however, as vthe intensity `ofthe side thrust referred to increases very rapidly both as a result of the use of heavier parts needful for transmitting `greater power, and directly incident to increases in the power transmitted, it has been found thatobjectionably Xcessive strain is applied to fieXible shafts utilized for comparatively A,heavy work, as, for example, rfor driving large drills,

rate and i frequently break near the point of attachment t@ ySUSh prior stands,

Y Vemery wheels or ffloorsurfacers; and that such shafts rapidly wear and deterio` Because of the side thrust just referred to,

it. has been found' to be'undesirable to mount prior forms of such driving stands in a readily movable manner, when sameV are to transmit comparatively large power; yas such side thrust will, und-ercertain conditions, cause prior forms of driving stands (if readily 'movable' over the'floor' or other surfaces upon which they are supported) to creep around so las to cause eircessive strain tothe flexible shaft and, in extreme instances, to causedisastrous vkinking 0r breaking of the vflexible shaft, unless manually or Y otherwise held against suoli creeping movement Vduring use thereof.

' An object of this invention is to provide a driving stand comprising a source of driving power (such as an electric motor)4 and lwhich'is adapted for so transmitting the driving power of such source to a flexible shaft carried by suchstand that such shaft may be employed at any side of the stand, either vertically oi' horizontally, and which will automatica-lly'follow all movements of the working end of `such'shaft so as to miniinize the strain and wear to which such shaft will be subjected because of movements of the working end thereof incident to the intended use thereof.

Another object is to provide such a coinbined motor and driving' stand Iwhich is so arranged that the speed ratio of the flexible shaft to the motor may be readily altered.

Another Objectis to provide such a driving stand in which the driving stresses will be so balanced that there will be no apprc-ciabletendency for any part of the stand to move out of alignment with the flexible shaft because of changesin the amount of torque incident to variations inthe nature of the work accomplished' thereby.

Another objectis to providey such a stand which is so constructed and arranged as to be adapted forrsupport upon an ordinary floor or platform, and in which the Weight of the various parts is so distributedV as to minimize all tendency of such stand to tip over as a result of any stress applied thereto incident to the use of the flexible shaft carried thereby upon any Object Vat any side thereof and either above, parallel with or below theplane upon which such stand is supported.

, Anotherobject is to provide such astand fwhi'ch is suited for mounting *upon wheels lll) titi

ni' miler#1 mi t'hiitJ it` nui he readily tranceiluiitztid :irnui pince to pince uiuin :il livin', puif'enient. (leek. seliiiltild or other ordinarily uruiluhle .surizice zuijueeut' tn Lihjetftn uiinii whit'h it is desired tu neri'rirui wnrl; through the utilizutinn of :i ilexihh. Shultz; ii'hieh hiru noti iiequii'e riixieeizil h 'ueiug ni' iirtteniug tluiinghr ut'iiii-Ltituin thereof; und which muy lie utilized while heilig; moved ifitiui (luie iininti tu unnther.

itili ot'luii nhjeeth: will he in imi'thhi'iuui-s :uid iii iilirt #neeititinll-r pointed out in the :lfiilluii'iii sptieii'iezttiiin.

lhhl iurentifin ennriirits nl certain ieuturivi iii' eiiuihinntiirin. '-iinsli'iictinu und :wrangeuuiutz ntf hurts irliiiii erin he rezuliltv luider- .ksttieit h v reference tu the iihifltrzitii'e enihndinient liieiieiii' i'luiu'u in the unnexed druiriuygu und lieriiri:iiter nuire iiilij.' tiehcrihed. hut this ini'enhin noti limited tti the euihiulh utentiA su shown :ind deserihed other einhudiiiieiitiei uuilv he wiiitiiuted, within the r-feuilii m" the zipiifiuiwi eiziiiii. eiuiihijt'ingj iizirh; di ti'ei'inii; in niunher, euiiistiuetimi :intl iifiuiigleiiienti ii'iini the tim-i)inrizinying illus tiutirt tlifir-inreurni. without departingA Aifrnni tht; spirit' nl? this invention.

l'lihe iieilieiieti rluirzutei, ileiuit'twsiuiiizir iiiii'tt-i thriiugiuiut the ziet-ouipunyiiig;l draw! .iniqua iu which- ,liigui'e l 'isf :i iiei'hpeelive View oi .1 lli-it'- iug; stuud und iiexiiih; sha1 it' tiiiiimdi'iug thil iurenticin. slinwiuh' :in euiery wheel guard und liiiiui-gz'iip setuietl tti the li'ee enti 0i he ilexihle fihni't" :ind rehuwiugg lhe 'urious ini-tn iiiinitinned ,iur grinding operations ieiii iihe have ui? the ,@tnntl;

iihg; L. in :i `side eieriition nl" the stuud oil l. the 'iree end nl the i'lexihle .ehn'tfti hiring.;y equiiitietl with :t t'iriet drill. und thrI rui-inuit hurts heine' im=-1itifnieil 'im' drillingn rti'tiifzil luiie;i nent' the harte iiil they stuud:

Fig. 5i is :i iiliii viert iii' eert'uin Ui' the puits :is shown h r Fig'. und

Figi-4.1i, 5 sind t'i :ire details. iizirt'ly in eel'- titiiut'o he referred t0.

sie; uhmrn iu Fui-if. i tti l. iiichtsiire, the h-.uae E r-s ring-like in Yitu-ui. htiviui; u rertivui niieiiitul' tlurethriiugh i'i` euiiiieient size lu i-itreirl :i siiitiihle driving; nuitni. 'ifhe lii'titii-:ets :lit unil li :1re uitnhi-r neeured tti one ide utE the hziee Qi?. :intl the l'eei 121% :ind El) :1re r-el'urid te the` tit'hti' Side mi Suid huele.

i i 71 nre jetunziled upon the li i il'.

he irlieeiS Lfi lind :mie und :sind :ixie ist. in turn. iuurnaled in the lrzieliet's :2li und The huniile ih is eel-tired iii tine end 0i" the hair lil :intl the other end iE Suid hzir joui niiieil in the hrzielet 'lfhe hruehe 32 is secured to the enter surface of' the hafe Q2 ut; u point intermediate the elet 2S and 29. The iur 33 is Carried h t the hair 3l in such iehithiin te the hitse- BQ `t'initxkiuien the luindie 3l) is raised. fthe enr will engage the side of the hase 2Q filiere the hrzielet 312 heiiie the handle il() reaches :in elei'iit'ini'i ut which il unify he et,iiii'enient'iiY heliifi while hinting the stuud iiitnn pieten to iiiziee, :au thnt ifurther upii'urd nioveuieut mit iii-.iid hunllle will lill the iiet 2li und 2t) elezii i'rnni the illnnr tu' other suriuee, uiinu which the Stzinil iu supported.

The hihi@ Iii is, supported uliun iiiileis, such us the roilei lit" shown in Fig. ai. e-aueh rollers heiugg; interlinfitiil hetu'een the luwer laufe (iii ssnid t'zihie und the upper hice, nl the has: hir the puriuiue nt 'iizuiiiihtling reizitire niureinent: t'luireimlireen. The edge olf 'the tzihie i-iuri-iea u dnirutiui'diy extending iiunge bt im: engugingj the intese im thu purpose ofi retaining; .said tizihie in nuhrittiulilith' concentric rehitiinii with .Suid hurle.

The nuitnr 23T hee-urii tu the under with,` 01'? the tiihle 3l. :is h i' uieuns oi? the hnlt :iii und 2li) siluivvn iu Fig. ai. Suid nuitmf de pending .from the under slide 0l said hihlu t-hrnugh the opsniiig i.irovitltrd in ihe hau-se liriiui the 'ftirelyziiiug it:` will lill einen thatl the tzihiti il i5 niiuintld 'hir rut'utinn in u liciriznnlui plane :1nd therefore muy' he properly milled :i tiurnlzihl i; und that; the hzihe 2. Wheels 2? :ind Qi. :ixh 2li' und h 'ziciutls :2li und 2T iurni hurtsy 0i :i marriage upon which Huid futile is mounted.

.ik i'ilxihie nhie it) is in'iii'idet'l 'im' etui dusting oherutiiigi' curieri' tu the mutui* 3T, und :i .switch `il is provided ,iriif :il-uiting und stopping; Suid nuitiir.

The inutnr nulle)v fi-2 (flee liig. iS situ- :ited in suitzihle i'elziiinn tu un tipeuinf.;` lil tihroturh the hasse, 22. .en t'hut; the heilt il; muy pzus liiuiiugh uuid opening to :intl ifitnii will pulley lf2 :inr u` niu'ptile iieieinziiter uuiie 'fully explained.

The lower truls` fif tiul uluiflhts :'it) und hl ire iirniiy revured tu tht` upper uriuee ni he t'uhie 1i-i. und the upper eiuf'm` cil' Huid un ights curry the hinein; 552 und .53. The iinekis ft2 und nii :ire :finiiizu in eiiiintifiiet'inn uid there'lnre :i desifi'ii'itinn 0i" either nilE nid hliic'iis will Suil'iee 'ini hnth.

ei'eriing tin Fig. (S, it will he Seen that euch nf these hincha hais un openintgI 54h tilierethiougii in which the Shaft:- 55 is joui:- niiled. :ind that: hush-es :"it'i :ire 'itiruuid on the inner iiuees fit Finiti hioeks upon which the cradle T iS juui'nuied hy melius (if the straps und 5S). loi ai. purpose `which will he hereiulffteif nuire full),vv explained.

The pulley (3U Vis lined upon the ishziiift; il' outside of the upright 5l, find the pulley (il i5 iiixed to said .sh-.itt hetween the uprights 50 und l.

The reds G2 und G3 ure h'xed in the cradle 5T. und :idiciining ends of Suid rods are seeiued 15o the hearing block (il.

The ieroiuhie part (See also Fig. 5) is jeurnziled in the hleeii (il, :ind has the pulley (it fixed te one end thereoi'f; the other end of said part; G5 has :i recess 6T therein llt) ist)

receiving'the driving ytongue of a flexible shaft; said part therefore `forms a driving -member for a flexible shaft.

' rlherwoluble part65 ridesin the block 64 between the ball bearing races 68 and 69; the sleeve 70 being interposedbetween vsaid ball races andsaidblock. Thev sleeve 'TO is journaled in the block '6l sofas to permit rotation therein, and said sleeveA carries the nipple 7l, which `nipple Visy externally threadl `ed for connection thereto of thevferrulef72 which is fixedy u'pon'one end ofthe flexible shaft casing 78. 'f l i,

fEhe weights 8O and 8l are slidably mounted upon the rods 62 and 63,'respectivel`y, so as to counterbalance the lpor-tions of said rods which carry the bloc-k 6ft, said block, and the parts 'carried `by and depending therefrom. Whenthe parts are. in a position such as that indicated by Figql, it' is-evident that the weight to be so Qcounterbalanced is far less than whenthevparts are positioned las indicated' by Figsgf2 and 3; hence the weights 8O and 8l are arranged .toslide along the rods 62 and 63, respectively, so as to act with `ma': inium effectiveness when the parts are positioned as'indicated by Fig. 2 andso as to act with minimum efecjiveness'when the.: parts are' -positioned as "indicated by Fig, l.y I' l Gushioningstops 82 and S3 are provided upon the ends 'of the rods 62 and 63, respectively, for limiting the movement of the weights 80 andSl away from the cradle 57,

' and cushioning stops Stand 85 are provided for correspondingly limiting the movement Y of said weights toward said cradle.

The 'beltil'fl connects the pulley 6l with the pulley 66, so that `the power delivered kto the .belt ist by the rotation of the motor pulley l2, will be transmitted thro-ugh the pulley 6l, the shaftk 55, the pulley '60,'said belt Tet, and the lpul'ley 66,` to the revoluble part65. I f n Referring nowr lmore paiticularlyto Fig. l. itwill be :Teen that a grinding fixture is applied tothe free end of theflexible shaft casing 73, which fixture comprises the hand grip or `handle Q0 andthe 'emery wheel shield or guard 91. ln Fig. 2,' a; hand grip 92 is shown at the free endy of ther casing 73, and a chuck 93 to/,be driven by the flexible shaft contained inthe casing TShndcarrying a twist drill 911;' are shownr below the grip 92.

ln' assembling driving 'stands in accordance with this invention, the ratio between the motor pulley 42 and thefflexibleshaft driving pu"'ey 66 may ylie-readily arranged, rfor Vindivi vual stands, soas to provide maximum working` efficiency 'for the purpose for whiehthe viexible Ashaft is to beemployed', by suitableselection of pulley sizes for the pulleys 42,61, 60and66.' p Y ,l

' Aholde`r`95 is'secured to the upright 50,

,motor willat all timesv be Y(see Fig. l) saidholderlbeing 'so fittedv to the hand grip 9,2 and the ferrule adjoining the handle y91 that the fre-e end of the flexible shaftmay'be securely retained in said holder, tothe end that the emery wheel,

drill or otherY tool operated bythe. flexible shaftmay be usedv in a yitationary position.

The hook 96 is provided for carrying a coilof the cableflO, when 'the stand-'is being moved fromplace t-o place.

' 'In the operation of the driving stand shown by the accompanying drawings, VVsuch Stand is movedr to a'position adjoining the place where work is to be accomplished, the cable 40 is connected toa source'of current for'operating the motor Si", the switch 41 is' operated to place the motor in electrical connection-with the conductors of the cable 40, and the hand grip 90 or92 (as the case mayk be) is grasped, and the fixture carried at the free end Vof the flexible j shaft yis thereby manipulated so as to suitably apply such tool as is associated with such fixture to the object upon which work is to Abe accomplished. its such Avjfxture is'moved toward and away from-the base 22, the block 64 will swing at the end of the arm forming part of the lever comprising the rods 62 and 63 to which said .block is attached; and as said fixture is moved transversely to the axis of the base 22, the table 34 will turn around on said base so that the flexible shaft will at all times be disposaitr ina substantially straight line.

lnso far as the pull applied to the belt 74 by the pulley 6l tends to swing the block 64 around the bosses 56, such pull will tend to move'said blo'ck in a direction which will place the flexible shaft and the casing 73 under a slight tension, thereby cooperating with the other features of said stand in keeping saidl shaft *in alignment with the revoluble part 65 and in preventing the development of kinks or sharp bends in such shaft.

Although the structure shown will ygive best results, especially in cases where such a lriving stand is to be moved around on rough or irregular surfaces; in cases when the use of such a stand is to be within a comparatively restricted area-'throughout which a smootlnlevel'floor surface is provided, the base 22 and the supporting parts therefor may be omitted, and suitable castors Vmay be secured directlyrto the turn-table 3% so as to facilitate either circular movement of said table such asv that which is facilita-tcd'by the rollers 35 in the embodiment shown', or movement from place to place such as that which is facilitated by the wheels 33 and Sil.

in any event, the V,table Bel should be supported `atfsuch distance above the floor or otherl surface upon which the driving stand Ais fto belmoved that the under side of said clear of such floorl or'other surface,

Cil

During' the manipulatioi'i et the fixture carried al' the 'tree end o'l the llexible shaft, as; hereinbelm'e described, the operator maj7 have oreaeion to rotate the hand grip 90 or 92 (as the case may be) relativel)Y to the lmariue` (tlespecially in the use ot a hand `erip auch as the grip 9U shown by Fig. l. Upon auch rotation ot said casing', euch case ine will act through the nipple 7l to cause the .eleeve T0 to rotate in the block (il, so as to prevent subjecting' the casing ot the flex ible shalt to objm'tionable torsional strain; thereby avoiding; euch deformation et said casing` ae inieht otherwise be induced bv euch rotation oit the hand grip, and thereby, in turn, preventing the development ot the said detormation or other injury to the flexible sha'tt and itis4 easing' such as ie likely to oceur in the absence olt jin'ovision 'tor rotation ot such a casing` relatively to its comparativelj1 tixed support.

ln constructing erivinp'stande in accord anice with this invention, itl the llexible ehatt is to be employed under such conditions that there will he no occasion ilor the rods G2 and oil to enine through a very extended are, a` tixed counteriveight ma)Y be substituted 'tor the slidable etnmterweights S0 and 8l; and. under `nome coralitioneI oil service the other l'eatures oit this` invention majv be utilized without the employinentot any counterweight.

lt is believed that the foregoing dcecrip tion, taken with the aecomjninying dra wings. will clearly disclose the construction and operation ot my improved driving` stand; what l therefore claim and deeire to secure by l,.etters Patent olI the lUnited States ot America is:

l. .l driving`- Stand tor a flexible ehatt rompriaingg a i,ino'-lilie bane. a table mounted upon said bane l'or rotation in a horizontal plane in relation thereto. e. motor Secured to the under side ot said table Within said base1 llexible .shaltt drivingl and carrying menne, and a Support tor said means Secured to the upper tace ot Said table and permit` tine' n'iovement ot said means in a vertical plane,

El. A driving' stand for a llexible Shalt comprising; a rine'dile base, a table mounted upon said base 'tor rotation in a' horizontal plane relative thereto, a motor Secured to the under aide ot .said table Within said bane. a standard secured to the upper surface oit said table an intermediate sha'tt journaled in `@aid standard. a boss carried by said :standard in erbstantiall]v concentric relation with said shalt. a lever Atulcruined aro-und said be i. a llexible ebalit and a driving` ineinber therefor, said member being ournaled at one end et Said lever that the axis of rotation thereof is substantiallj`- tangent to the arc described by the end of said lever during the rotation thereof around said bose, pulleys lor ell'ectngl belted connection between said 'flexible shatt member and sind motor, and a connteiaveight elidably mounted upon the other end ot said level'.

25. A driving stand Yfor a flexible fshatt comprising a ring-like base, ay table mounted upon Said buse tor rotation in a horizontal plane relative thereto, a motor Secured to the under side ot Said table within said base, a Standard secured to the upper sur'lace ot said table, an intermediate ehatt journaled in eaid standard, a boss carried by said Standard in substantially concentric relation With said shalt, a lever 'tulcruined around said boss, a llexible sha'tt and a driving' member thereitor, eaid member journatled at one end oit said leve` and being so j'iositioned that the axis ot rotation thereof is eubstantialljfv tan-- gent to the arc described by the end ot Said lever during rotation thereoit around said bose, pulleys for ell'ectine' belted connection between l@aid tlexible shaitt member and said motor, a eoimterweight slidably mounted upon thev other end ot Said lever, and ouah-- io-ned etope iter suitably limiting the elidine` movement ot said weight.

l. driving stand tor a flexible Shaft comprieing a ring-like base, a supper-tuur Wheel secured to Said base near one, sideY thereof, a` supporting toot secured to said bane near the other eide thereof, a handle pivotallyv connected to said base near Said toot eo as to permit limited movement ot .said handle in a vertical plane, a table mounted upon `Said base, bearings eomprieing' rollingmembers, between said table and said bane tor facilitating' rotation ot said table in a horizontal plane relative to said base, a motor secured to the under eide ot said table Within said baee, a revohible part adapted lor driving a' `flexible Shaft, menne tor securing an end ot a llexible sha'tty caeinp,I in Suitable relation to said reveluble part a flexible shaft (waning one end ot which is cured to said means, a flexible shalt within Said easing operatively connected to Said revolnble part, a jointed and eounterbalanced supporting' structure Jfor Said revoluble part secured to the upper tace of Said table and arranged to permit movement oli said part to describe a complete circle in a vertical plane.

A driving Stand :tor a flexible nha'l't comprieiin;l a hollow carriage, a table 1nount ed on said carriage for rotation thereon in a horizont-al plane, a motor secured to the under `eidel ot said table and projectingnr doavnwa'rdlv through said carriage, a Supportiin; member secured to the up er tace ot said table and extending upwar ly therefrom, an intermediate shalt journaled near the upper end et said member and carrying two pnl leve one of which is suitably positioned lor belted connection thereof` with said lnetor, a counterbalanced arni fulcruxned on said :ill

lll)

lou

lll)

with said shaft, a second shaft journaled in an end of'said armA and carrying a pulley in suitable relation tothe other pulley Ofsaid first named shaft for belted connection therewith, said second shaft being so constructed and arranged as to yfacilitate operative connection thereto of a flexible shaft, and a connection carried by said arm end and so constructed and arranged as to be adapted for the oonnectionthereto of an end of a flexible shaft casing.

6. A driving stand for;` a flexible shaft comprising a ring-like base, a table mounted upon said base for rotation in a horizontal plane in relation thereto, a motor secured to said table, flexible shaft driving and carrying means, and a support for said means secured to said table andpermitting` movement of said means in a vertical planep 7. A 'driving standl for a flexible shaft comprising a ring-like base, a table mounted Y upon said base for rotation ina horizontal plane relative thereto, a motor secured to said table, a stan-dard secured to said table, an intermediate shaft journaled, in said standard, a boss carried by said standard in substantially concentricV relation with said shaft, a lever fulcrumed ar-oundl said boss, a flexible shaft and a driving member therefor, said member being so journaled at one end of said lever that the axisv of rotation thereof is substantially tangent to 'the arc described by the end of said lever during the rotation thereof around said boss, pulleys for effecting belted connection between said flexible shaft member and sai-d motor, anda counterweight slidably mounted upon the other end of 'said lever.

8. A driving 'stand fora flexible shaft comprising a ring-like base, a table mounted upon said base for rotation in a horizontal v gent to the arc described by the end of said lever during the rotation thereof around said boss, pulleys for effecting belted connection between said flexible shaft memberL and said motor, a counterweight slidably mounted upon the other end of said lever, and cush-y ioned stops for suitably limiting the sliding movement of said weight. Y

9. A driving stand for a flexible shaft comprising a ring-like base, a table mounted upon said base, bearings'comprising rolling members betweensaid table and said base for facilitating rotation of said table in a horizont-al planeV relative Y'to said base, a motor secured to saidtable, a revoluble part adapted for-driving a flexible shaft, means for securing an end of a flexible shaft casing in suitable relation to said revoluble part, a flexible vshaft casing one end of which is secured to said means, a flexible shaft Within said casing operatively connected to said revoluble part, a jointed and counter-balanced supporting structure for said revoluble part secured to .said table and arranged to permitl movement of said part to describe a complete circle in a vertical plane.

l0. A driving stand for a flexible shaft comprising a table mounted for rotation in a horizontal plane, a motor secured to said table, a standard secured to said table, an intermediate shaft journaled in said standard, a boss carried by .said standard in substantially concentric relation with said shaft,'a lever fulcrumed around said boss, a flexible shaft and a driving member therefor, said member being so journaled at one end of said lever that the axis of rotation thereof is substantially tangent to the arc described by the end of said lever during` the rotation like, so supporting said table as to facilitate rotation thereof in a horizontal plane, a

motor secured t-o said table, a revoluble part adapted for driving a flexible shaft, means for securing an end of a flexible shaft casing.y in suitable relation to said revoluble part, a flexible shaft casing one end of Which is secured to said means, a flexible shaft Within said casing operatively connected to said revoluble part, a jointed and counterbalanced supporting structure for said revoluble part secured to said table and arranged to permit movement of said part to describe a complete circle in a vertical plane.

AIn Witness whereof, I hereunto subscribe my name, this 22nd day of July 1921.

VINFRED W. ELLIOTT.

Veo 

